Phonograph



G. STUPAR.

PHUNOGHAPH.

APPLICATIQN F|LEDJuNE2s,192o.

Patented Sept. 13,1921.

l mi@ yo:

`l UNITED STATES` PATENT OFFICE.

GOTTFRIED STUPAR, '0F CHICAGO, ILLINOIS. g

PHoNoGnAPrL Be it known that I, GOTTFRIED STUrAma citizen of the United States, residing at Chicago, in the county of Cook and State .of

which the following is a specification., Y

` The invention relates to improvements Vin Illinois, have invented certain newanduse-l ful Improvements in Phonographs, of

phonographs and has especialreference to theconstruction of the tone block or sound conduit located between .the tone arm and the horn.

One of the objects ofthe invention is to reiiistruments. j

Another object is to provide a simplified means formodifying the sound of such in struments.

Another object is to provide a vvertical sound conduit, leadingfrom the tone arm to the horn, composedl of twov pieces made in a single length, subsequently cut to size and' in which two duplicate'parts are suit# abl joined together. j v

' gther, further and more speciiicj objects of the invention will become readily-apparent, lto persons skilled in the art, fromy a con! duce the cost ofmanufacture of phonograph sideration ofthe following Vdescription when taken in conjunction with thev drawings, whereinz* y WV" Figure 1 is a section through a fragment of a phonograph casing showing my tone block or sound conduit and modier in place.

Fig. 2 is an enlarged section taken on line Q eaof Fig. i. i j

Fig. 3 Vis an enlarged section, similar tov F ig. 1, 'showing the sound conduit fully open.

Fig. 4; is a similar view showing the sound conduit fully closed by the modifier.

Fig. 5 is a side elevation of one-half of the conduit structure'which is a duplicate of the other half.

In all the views the same reference charac'- ters are employed to indicate similar parts.` In most phonograph structures, of the ydisk type, there are, located in the casing of `the structure, a tone arm,which carries the soundboX; horn from which the sound issues and a tone block orV conduit connecting the tone arm to the horn. In some suoli structures the large end of the horn is closed,

*,Sipecvi'cati'onvof Letters Patent. Patented 13, `192,1.

192e. serial No. 391,940.

modify the sound by means of a constricting device located in the sound conduit.

w In the specific structure illustrated, .10 is a phonograph casing, having a motor board 11 and a horn chamber 12. The motor 13 Vis employed to rotate the `table 15. A horn 16 is located in the horn chamber 12, its larger end extending toward the front and its smaller end, toward the rear of the casing 10. A swiveling tone arm 1'7 islocated in the usual position With its lower open end 18v located v'practically immediately above the small end 19 of the horn 16. A tone block or sound conduit 2O is employed for conduct-y ing the sound from the tone arm 17 into the horn. In the particularstructure illustrated the-conduit consists of two duplicate parts 21 and 21"1. 'Originally the members 21 and 21L were parts of the. same elongated. strip, in which the tongue 22 was on one side 'and the groove 23 in which the tongueis to be included, on the opposite side of the`4 strip.

ofthe strip and the groove in which theV tongue is to be received, on the opposite side, so that when Vthe strip is cut in suitable lengths, the two duplicate parts -will go together, and, when placing glue around the tongue and within the groove 22 and 23, the

parts may be ysecuredy together as one pieceV and the opening 25 ,will thenbeof circular form. `Near the lower end, 26, of thestructure 20, I bore a transverse hole 27,' which bisects the bore 25 and communicates with the interior of the horn 16. .Hole 27 on one side of passage 25, serves to interconnect the horn and the sound passage, and, on the other side serves as a journal or support for a rotatable sound controlling valve, to be hereinafter described. Before boring the hole 27, however, I place a plug 28 in the bore 25 and bore the hole through the plug at the same time the hole is bored through the members 21 and 21, valve in the form of a wooden shaft 29, fitting neatly in the hole 27, has its front end cut obliquely on a curved line 30, producing a conc'aved depression 31 which conforms with the radial dimensions of the bore 25.- It will be observed, by looking at Fig. 3, that the line 3() defines theopening from 25 to 27 on a curve,

so .that the sound coming from the tone arm 17 to conduit 20, striking the curve 30, will be projected into the interior of the horn 16 without producing echo. Vhen'the shaft 29 is rotated 180 degrees, into position shown in Fig. 4, the opening is completely closed so 'that nol sound will issue from the front end of the horn. The sound may be modified to a greater or less extent by rotating the shaft 29 into any position intermediate of the position shown in Figs. 3 and 4. The shaft 29 is preferably passed through thel bach wall of the instrument l0, and a washer 32 is placed on each side of the wall, being held in place by the pins 84, to cause some friction so that the shaft 29 will remain in the position in which it is moved. A handle 35 is connected to the shaft 29 for the purpose of rotating it. In whatever position the shaft 29 may be placed, the curve 8O will have the effect of smoothly conducting the sound into the horn.

In making the sound conduit. 20 it is only necessary to cut the strip, of which the two members 2l and 21a are made, into uniform lengths and glue the strips together, as shown in Fig. 2, then bore the transverse holep27 and fit the shaft 29 therein. This is avery simple and inexpensive means of producing'the structure and it is very effective in its'operation. Y

Other means than that. shown may be em ployed for rotating the shaft 29 and instead of rotating it, it may be reciprocated and accomplish the same result.

`When the conduit is made, in the manner shown, it also serves as a means, to some ex,- tent, for supporting the motor board 7 in its place, it rests directly under the motor board and immediately upon the bottom wall of the casing.

Having described my invention what I claim as new and desire to secure by Letters Patent is l. A phonograph sound directing device comprising an elongated block having a.

sound directing passage extending longitu dinally thereof from one end to a point near the oppositeend and a transverse opening therethrough intersecting the longitudinal passage adjacent one end thereof, the transverse opening on one side of the intersection cooperating in the directing of sound and on the other side providing a journal for a valve, and a rotatable valve for directing the sound from the passage to the transverse opening and operable to modify the sound passing therethrough.

2. In a phonograph having a movable tone arm and horn, the combination of a wooden bloclrextending between the tone arm and horn and having a longitudinal passage therethrough for interconnecting the tone arm and horn and a transverse opening intersecting the passage, the opening on one side of the intersection serving to direct the sound into the horn and on the other side serving to journal a valve, and a rotatable valve projecting through the journal into the sound passage and having its inner end oblique to the axis so that when turned to different positions the communication between the horn and sound passage will be Varied.

3. A phonograph having a movable tone arm andvhorn in combination with a wooden block having a longitudinally extending passage to conduct sound from the tone arm and an intersecting transverse opening therethrough, said openingen one side of the passage serving to interconnect the passage and horn and on the other side serving as a journal for a valve, a rotatable valve projecting through the opening on the journaling side thereof and into the passage to vary the area of communication between the passage and the horn, and a plug for closing the passage on the side of the valve opposite the tone arm.

In testimony whereof I hereunto subscribe my name. Y r

GOTTFRIED STUPARA 

